[v4 PATCH 0/3] mm/mempolicy: some fix and semantics cleanup

* [v4 PATCH 0/3] mm/mempolicy: some fix and semantics cleanup
@ 2021-06-01 15:14 Feng Tang
  2021-06-01 15:14 ` [v4 PATCH 1/3] mm/mempolicy: cleanup nodemask intersection check for oom Feng Tang
                   ` (2 more replies)
  0 siblings, 3 replies; 8+ messages in thread
From: Feng Tang @ 2021-06-01 15:14 UTC (permalink / raw)
  To: linux-mm, Andrew Morton, Michal Hocko, David Rientjes,
	Dave Hansen, Ben Widawsky
  Cc: Andrea Arcangeli, Mel Gorman, Mike Kravetz, Randy Dunlap,
	Vlastimil Babka, Andi Kleen, Dan Williams, ying.huang, Feng Tang

Current memory policy code has some confusing and ambiguous part about
MPOL_LOCAL policy, as it is handled as a faked MPOL_PREFERRED one, and
there are many places having to distinguish them.  Also the nodemask
intersection check needs cleanup to be more explicit for OOM use, and
handle MPOL_INTERLEAVE correctly.  This patchset cleans up these and
unifies the parameter sanity check for mbind() and set_mempolicy(),
which helps to make further changes easier (notably MPOL_PREFERRED_MANY)

The patchset has been run with some sanity test like 'stress-ng'
and 'ltp', and no problem found.

Thanks,
Feng

Changelogs:
    v4:
      * fix a problem in mpol_set_nodemask() (Michal Hocko)
      * update cover-letter and commit log (Andrew/Michal)
      * add Acked-by info

    v3:
      * fix logic of mpol_rebind_preferred() (Michal Hocko)

    v2:
      * rename mempolicy_nodemask_intersects() to
        mempolicy_in_oom_domain() and correct commit log (Michal Hocko)
      * change the mpol syscall param sanity check (Michal Hocko) 
      * combine the 3/4 and 4/4 in v1 into one patch,
        and further clean the logic (Michal Hocko)

    v1:
      * use helper func instead of macro for patch 2/4 (David Rientjes)
      * fix a possible null pointer case in patch 3/4 		
      * update commit log for 1/4

    RFC v2:
      * add for oom check fix patch 1/4
      * add the unification patch for mpol preprocess 2/4

Feng Tang (3):
  mm/mempolicy: cleanup nodemask intersection check for oom
  mm/mempolicy: don't handle MPOL_LOCAL like a fake MPOL_PREFERRED
    policy
  mm/mempolicy: unify the parameter sanity check for mbind and
    set_mempolicy

 include/linux/mempolicy.h      |   2 +-
 include/uapi/linux/mempolicy.h |   1 -
 mm/mempolicy.c                 | 213 ++++++++++++++++++-----------------------
 mm/oom_kill.c                  |   2 +-
 4 files changed, 94 insertions(+), 124 deletions(-)

-- 
2.7.4

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